initPulldown = function() {
	if (document.all && document.getElementById) {
		
		navRoot = document.getElementById("mainNaviList");
		
		for (i = 0; i < navRoot.childNodes.length; i++) 		{
			node = navRoot.childNodes[i];
			
			if ("LI" == node.nodeName && node.childNodes[1]) {
				
				node.onmouseover = function()  {
					this.childNodes[2].style.display = 'block';
				}
				
				node.onmouseout = function() {
					this.childNodes[2].style.display = 'none';
				}
				
			}
		}
	}
}